Largest Robbins TBM winning at NiagaraThe 14.4 m-diameter Robbins hardrock TBM is now two-thirds along the challenging alignment at Niagara, having broken a few records in between times. Contractor Strabag has been innovative in collaboration with both client and supplier to push this project along in difficult and largely unforeseen geology. Read the full press release. 25/10. "14.4 m-diameter Robbins TBM in launch chamber at Niagara"